Avalanche forecast for Indre Troms Thursday 2019-02-14

3
Considerable
Published:

Be careful in areas with newly deposited wind slabs. Persistent weak layers can be present where the snow cover is thin. Wet avalanches can occur where the percipitation comes as rain.

Wind drifted snow (slab avalanches)

Poor bonding between layers in wind deposited snow

Avoid steep (more than 30 degrees) areas with fresh wind deposited snow, especially convex terrain. An avalanche is easier to trigger where wind slabs are thin or soft. Look for areas where the wind recently has deposited snow, typically behind ridges, ribs and in gullies. Remember that local wind effects will cause variation in where the wind slabs occur.
2 - Medium
Low additional load
Widespread steep slopes
Possible

Wet snow (slab avalanches)

Water pooling in/above snow layers

Avoid avalanche release and run out areas. Wet snow avalanches tend to release spontaneously. Stability decreases when the snow surface gets wet and soft. Timing is important.
3 - Large
Spontaneous release
Specific steep slopes
Possible

Persistent weak layer (slab avalanches)

Buried weak layer of faceted snow beneath a crust

Avoid skiing in avalanche terrain (steep terrain more than 30 degrees and in runout zones). NB, remote triggering is likely. Make very conservative route choices, especially in unknown terrain, after snowfall and if temperatures rise. Identifying areas where the weak layer is present might be difficult and requires experience. Danger signs are whoumpf-sounds, cracking and recent avalanches. However, absence of signs does not mean it is safe.
2 - Medium
High additional load
Isolated steep slopes
Possible

What are avalanche problems?

Observations the last 3 days (map placed)

2 mm precipitation.
Strong breeze from southeast., change to fresh breeze from the south during the evening.
-12 °C to -3 °C at 1100 m a.s.l.
Plus degrees up to 200 m a.s.l. during the evening.
Cloudy.

For updated info, please visit yr.no
21 mm precipitation, up to 42 mm in the most exposed areas.
Strong breeze from south., change to gale from the west during the evening.
-10 °C to -2 °C at 1100 m a.s.l.
Plus degrees up to 600 m a.s.l. during the afternoon.
Cloudy.

For updated info, please visit yr.no

Observations the last 3 days

Indre Troms / BARDU

Snow

14.02.2019 kl. 15:51

116 masl

Jonas.hansen@live.no (***)

Weather

Rain 12 m/s from SW ↗ 100% clouds Sterk vind, kombinert med regn. Sludd. Snø. Veksler veldig

ObsID: 180994

Indre Troms / BARDU

Snow

14.02.2019 kl. 14:17

608 masl

StianS@forsvaret (***)

Image Of Snow Profile
Image 1 of 1 Of:  Snow Profile Copyright: 

Danger Sign

Quick temperature change Område: Generelt på fjellet. Beskrivelse:

Recent snowdrift

Large snowfall Område: Generelt på fjellet. Beskrivelse:

Tests

ECTP11@40cmQ2

ECTPV@10cmQ2 Poor

Snow Profile

8 stratigraphy layers observed 2 Tests connected to snow profile

ObsID: 181043

Indre Troms / BALSFJORD

Snow

14.02.2019 kl. 13:25

504 masl

bjorgnar (Unknown)

Image Of Tests
Image 1 of 1 Of:  Tests Copyright:  bjorgnar Comment:  Q1 brudd slik jeg vurderer det.

Snow Cover

190 cm in total Some snow drift 45 cm new snow Much loose snow (10-30cm)

Tests

CTM11@60cmQ1 CTM11@60cmQ1

ObsID: 181031

Indre Troms / Sjufjellet120

Snow

14.02.2019 kl. 11:49

651 masl

bjorgnar (Unknown)

Image Of Danger Sign
Image 1 of 1 Of:  Danger Sign Copyright:  bjorgnar Comment:  Skred midt i bildet. Antar 30m bredt og 40cm bruddkant

Danger Sign

Recent avalanches Område: I denne fjellsiden. Beskrivelse: Ferskt skred. Ser ut til å ha gått i de øverste 40-50 cm med innblåst nysnø

ObsID: 181028

Indre Troms / BARDU

Snow

13.02.2019 kl. 13:45

644 masl

StianS@forsvaret (***)

Image Of Snow Profile
Image 1 of 1 Of:  Snow Profile Copyright: 

Avalanche Problems

Dry slab avalanche Buried weak layer of new snow Within half a meter A big and identifiable crystal in the weak layer. Easy to trigger 2 - Medium NE, E, SE, S

Danger Sign

Recent snowdrift Område: I denne fjellsiden. Beskrivelse:

Weather

Snow 8 m/s from NE ↙ 90% clouds

Tests

ECTP1@20cmQ2 Poor Bruddet går på et tykt (10-15cm) svakt lag med nysnø.

CTE1@20cmQ2 Poor Bruddet går på et tykt (10-15cm) svakt lag med nysnø.

Notes

Fersk vindtransportert snø har dannet et fokksnølag på mellom 15-25cm i sør- og østvendte heng. Under ligger det rester av nysnøen fra i går som lett går til brudd med liten tilleggsbelastning. Får utslag på 1. slag på 3 av 4 ECT-er med propagering på samtlige.

Snow Profile

6 stratigraphy layers observed

ObsID: 180826

Indre Troms / BARDU

Snow

12.02.2019 kl. 20:50

586 masl

StianS@forsvaret (***)

Image Of Danger Sign
Image 1 of 2 Of:  Danger Sign Copyright:  StianS@forsvaret
Image Of Danger Sign
Image 2 of 2 Of:  Danger Sign Copyright:  StianS@forsvaret

Danger Sign

Large snowfall Område: Generelt på fjellet. Beskrivelse: Stort snøfall siste døgnet med lett snøfokk med vind fra vest. Rundt 25cm nysnø generelt under skoggrensa og oppbygging av skavler over 1 meter i leheng, spesielt i tilknytning til bekkedaler og juv.

Snow Cover

90 cm in total Some snow drift 25 cm new snow Much loose snow (10-30cm)

Notes

Mye nedbør som har lagt seg i hele fjellet, med enkelte perioder lett snøfokk gjennom dagen. Nå ligger det store mengder snø tilgjengelig for transport, og mange le-heng har bygd opp store fonner allerede.

ObsID: 180609

Indre Troms / BALSFJORD

Snow

12.02.2019 kl. 13:50

355 masl

torben@obskorps (***)

Avalanche Problems

Buried weak layer of faceted snow beneath a crust påbegynt kantkorn dannelse, antas?.......

Snow Cover

100 cm in total No snowdrift Elevation of new snow 0 masl. Snow line at 0 masl Much loose snow (10-30cm) Dry det øverste laget 1-2cm har forsiktig begynt å flake seg, under er dt nysnø som er ubundet. 20-25cm, så fokksnø (pencil ) som er 20cm tykt. bruddet på ect gikk på påbegynt kantkorndannelse? oppå den gml harde snøpakka fra mildværet som var tidligere

Tests

ECTP16@45cmQ2 Medium

ObsID: 180552

The bulletin does not include a detailed text about the avalanche conditions. This is only given in Norwegian. Translate it using google translate if you like. The text result will be informative, and most likely amusing

For planning your trip and recognizing avalanche terrain, use maps.

Norway has 1:50 000 maps for the whole country. Maps can be bought at bookstores and sports shops, or printed from the net.

Visit www.ut.no for topographic maps online. For slope angle maps, see NGI slope angel maps ("helning" means slope angle).

Modelled snowpack and historic and current weather information can be found on the webpage senorge.no. This site uses information from the weather stations and interpolate values from the stations for gridded maps.

Detailed weather forecast can be found online at www.yr.no or www.storm.no. Yr.no is also in English, but the weather in text format is only given in Norwegian.